<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/3.2.40/vue.global.js"></script>
</head>
<body>
    <div id="msg">
        <div>
            <h1>{{fix}}</h1>
        </div>
    </div>
</body>
</html>
<script>
    const app = Vue.createApp({
        data(){
            return{
                name:'ming'
            }
        },
        computed:{
            fix(){
                return this.name + "#"
            }
        }
    })

    app.mount('#msg')
</script>